Nona Gaye, second from left, daughter of late soul singer Marvin Gaye, and lawyer ichard Busch, front right, speak to the media outside a Los Angeles court in March 015. Mr. Gaye's heirs won a $7.4 million judgment against recording stars Robin hicke and Pharrell Williams, whom a jury found plagiari/ REUTERS The lines are being blurred when it comes to infringement of copyrighted music, as musicians turn to the courts to defend their art and large verdicts garner major media and insurer attention.